When backflow occurs, water runs backward through the water system. This water could contain something that might contaminate the drinking water supply. While we strive to maintain positive pressure in the system at all times, events such as main breaks and firefighting can contribute to backflow conditions.

When backflow occurs, water runs backward through the water system. This water could contain something that might contaminate the drinking water supply. While we strive to maintain positive pressure in the system at all times, events such as main breaks and firefighting can contribute to backflow conditions.

A cross connection is any connection between piping that carries drinking water (also known as potable water) and the piping or fixtures that carry other types of water or substances that are not safe to drink or may impact the taste or odor of water (also known as nonpotable water). Common cross connections include hot tubs, sprinkler, irrigation systems, and wells.

You may need to protect your water heater from thermal expansion when you install a backflow prevention device at the water meter. This may be provided by the installation of a thermal expansion tank and a temperature and pressure relief valve. For more information, call us at 503-665-9320 or contact a licensed plumber.